Expansion of Product_{m>=1} (1+q^m)^27.

Terms

a(0) =1a(1) =27a(2) =378a(3) =3681a(4) =28134a(5) =180144a(6) =1005957a(7) =5032422a(8) =22986801a(9) =97229361a(10) =384953553a(11) =1438738443a(12) =5110502256a(13) =17348445108a(14) =56541857409a(15) =177611637141a(16) =539501563962